{"id":"CVE-2026-71401","aliases":["EUVD-2026-67079","GHSA-p653-f3q8-xm5f","SUSE-SU-2026:3837-1","SUSE-SU-2026:3839-1","SUSE-SU-2026:3840-1","SUSE-SU-2026:3841-1","SUSE-SU-2026:3842-1","openSUSE-SU-2026:11636-1","openSUSE-SU-2026:21669-1"],"status":"published","title":"wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read","description":"An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.","severity":{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00262,"percentile":0.18116,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-191"],"published":"2026-08-27T12:19:36Z","modified":"2026-10-28T02:30:22Z","affected":[{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 12 SP5-LTSS","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-3.61.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-3.61.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Micro 5.5","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150500.3.47.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150500.3.47.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150500.3.47.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150500.3.47.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150500.3.47.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150600.11.20.1"}]}],"bundled":3},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP6","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150600.11.20.1"}]}],"bundled":3},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP7","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150700.3.8.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Micro 5.3","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150400.3.44.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Micro 5.4","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150400.3.44.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150400.3.44.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150400.3.44.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP4-LTSS","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150400.3.44.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP4","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.79-150400.3.44.1"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.80-2.1"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"wicked","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.80-bp160.2.1"}]}],"bundled":2}],"products":[{"vendor":"suse","product":"wicked"}],"references":[{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1274627","tags":["issue-tracking","report"]},{"url":"https://github.com/openSUSE/wicked/pull/1079","tags":["patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71401","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-p653-f3q8-xm5f"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71401.json","tags":["advisory"]},{"url":"https://github.com/openSUSE/wicked","tags":["package"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263837-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1274627","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71401","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71402","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263839-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263840-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1265221","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-44932","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263841-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20263842-1/","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-71401","title":"wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read","description":"An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.","status":"published","published":"2026-08-27T15:01:27.342Z","modified":"2026-08-27T19:31:06.894Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T14:19:49.199185Z"}],"euvd":[{"id":"EUVD-2026-67079","description":"An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.","status":"published","published":"2026-08-27T15:01:27Z","modified":"2026-08-27T19:31:06Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:01:26.820985Z"}],"ghsa":[{"id":"GHSA-p653-f3q8-xm5f","title":"An integer underflow was found in the DHCPv4 packet capture code of wicked....","description":"An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.","status":"published","published":"2026-08-27T18:32:23Z","modified":"2026-08-27T18:32:30Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T15:11:05.100142Z"}],"nvd":[{"id":"CVE-2026-71401","description":"An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.","status":"published","published":"2026-08-27T17:19:44.83Z","modified":"2026-09-01T20:54:51.287Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T14:12:42.035353Z"}],"osv":[{"id":"CVE-2026-71401","title":"wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read","description":"An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.","status":"published","published":"2026-08-27T15:01:27.342Z","modified":"2026-10-28T02:30:22.292583342Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T15:45:15.164658Z"},{"id":"openSUSE-SU-2026:11636-1","title":"wicked-0.6.80-2.1 on GA media","description":"These are all security issues fixed in the wicked-0.6.80-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-08-28T00:00:00Z","modified":"2026-08-29T09:15:04.355961249Z","updated_at":"2026-11-02T16:58:39.516824Z"},{"id":"openSUSE-SU-2026:21669-1","title":"Security update for wicked","description":"This update for wicked fixes the following issues:\n\nChanges in wicked:\n\n- Fix two OOB reads in ni_capture_inspect_udp_header and improve:\n  - Reject packets with ip_len \u003c ihl to avoid a size_t underflow of the\n    UDP length, which the checksum truncates to uint16_t (bsc#1274627,\n    CVE-2026-71401).\n  - Set payload_len to the remaining payload, not ip_len, which over-read\n    the DHCP option walker by ihl + 8 bytes past the buffer (bsc#1274627,\n    CVE-2026-71402).\n  - Avoid checksumming packets that fail the length/protocol checks and\n    tidy up the debug messages (bsc#1274627).\n  - Fix underflow check in ni_dhcp4_option_next to handle option code\n    and length separately as the END and PAD options don't have length\n    (bsc#1274627).\n\n  Thanks to Daniel Birtwhistle for discovering and reporting the issues.\n","status":"published","published":"2026-08-27T16:26:05Z","modified":"2026-08-28T17:30:03.735063322Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"SUSE-SU-2026:3837-1","title":"Security update for wicked","description":"This update for wicked fixes the following issue:\n\n- CVE-2026-71401: out-of-bounds read due to IP length underflow in checksum handling of DHCPv4 capture parsing \n  (bsc#1274627).\n- CVE-2026-71402: out-of-bounds read due to DHCP option reader being extended beyond provided allocation in DHCPv4\n  capture parsing (bsc#1274627).\n","status":"published","published":"2026-08-27T12:19:36Z","modified":"2026-09-04T18:23:11.700991727Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:3839-1","title":"Security update for wicked","description":"This update for wicked fixes the following issue:\n\n- CVE-2026-71401: out-of-bounds read due to IP length underflow in checksum handling of DHCPv4 capture parsing \n  (bsc#1274627).\n- CVE-2026-71402: out-of-bounds read due to DHCP option reader being extended beyond provided allocation in DHCPv4\n  capture parsing (bsc#1274627).\n","status":"published","published":"2026-08-27T12:21:00Z","modified":"2026-09-04T18:23:11.907252315Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:3840-1","title":"Security update for wicked","description":"This update for wicked fixes the following issues:\n\nUpdate to version 0.6.79.\n\n- CVE-2026-44932: indirect remote shell command injection due to insufficient sanitization of DHCP options written to\n  `/run/wicked/leaseinfo.*` files (bsc#1265221).\n- CVE-2026-71401: out-of-bounds read due to IP length underflow in checksum handling of DHCPv4 capture parsing \n  (bsc#1274627).\n- CVE-2026-71402: out-of-bounds read due to DHCP option reader being extended beyond provided allocation in DHCPv4\n  capture parsing (bsc#1274627).\n\nChanges for wicked:\n\n- Version 0.6.79:\n  - Fix to escape single-quotes in leaseinfo dump output used by the `wicked test dhcp4` and `wicked test dhcp6` and\n    written to the `/run/wicked/leaseinfo.*` files, e.g. to pass them to `netconfig`.\n  - Fix `posix-tz-dbname` and `tz-string` option processing checks to permit only valid characters according to\n    RFC4833.\n  - Discard string values containing single-quotes in other options.\n  - Trigger to regenerate `initrd` that may contain wicked binaries on updates from wicked versions \u003c= 0.6.78.\n- Version 0.6.78:\n  - `man`: small fixes in wireless manpage (gh#opensuse/wicked#1053)\n  - `rtnetlink`: fix `RTM_NEWLINK` name resolution in debug (gh#opensuse/wicked#1052)\n  - Add support for IPVLAN/IPVTAP (jsc#PED-1942, gh#opensuse/wicked#1050, gh#opensuse/wicked#1051)\n  - `fsm`: remove children reference array from worker (gh#opensuse/wicked#1049)\n  - `ifxml`: migrate and generate lower configs/policies (gh#opensuse/wicked#1048)\n  - `fsm`: use refcount and array macros in worker and policy (gh#opensuse/wicked#1047)\n  - `route`: use refcounted array and fix error leaks (gh#opensuse/wicked#1046)\n  - `utils`: add support for refcounted objects in generic array (gh#openSUSE/wicked#1045)\n","status":"published","published":"2026-08-27T12:21:23Z","modified":"2026-09-04T18:23:11.915963479Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:3841-1","title":"Security update for wicked","description":"This update for wicked fixes the following issue:\n\n- CVE-2026-71401: out-of-bounds read due to IP length underflow in checksum handling of DHCPv4 capture parsing \n  (bsc#1274627).\n- CVE-2026-71402: out-of-bounds read due to DHCP option reader being extended beyond provided allocation in DHCPv4\n  capture parsing (bsc#1274627).\n","status":"published","published":"2026-08-27T12:21:39Z","modified":"2026-09-04T18:23:11.903099962Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:3842-1","title":"Security update for wicked","description":"This update for wicked fixes the following issue:\n\n- CVE-2026-71401: out-of-bounds read due to IP length underflow in checksum handling of DHCPv4 capture parsing \n  (bsc#1274627).\n- CVE-2026-71402: out-of-bounds read due to DHCP option reader being extended beyond provided allocation in DHCPv4\n  capture parsing (bsc#1274627).\n","status":"published","published":"2026-08-27T12:22:40Z","modified":"2026-09-04T18:23:11.902998798Z","updated_at":"2026-11-02T15:54:05.392906Z"}]}}